Uroporphyrin is a chemical compound that occurs naturally in the human body as a component of heme, a vital molecule that carries oxygen in the blood. However, during certain medical conditions, uroporphyrin can accumulate in the body and cause health problems. Uroporphyrin impurities refer to any other substances that may be present alongside uroporphyrin, such as other porphyrins or metabolites, that may affect the accuracy of diagnostic tests or research studies. Accurately identifying and quantifying uroporphyrin impurities is crucial for effective diagnosis and treatment of porphyria, a group of rare genetic disorders that affect heme production.